OLDWICK, N.J.–(BUSINESS WIRE)– #insurance–AM Best has affirmed the Financial Strength Rating of A (Excellent) and the Long-Term Issuer Credit Rating of “a+” (Excellent) of AMEX Assurance Company (AMEX) (Chicago, IL). The outlook of these Credit Ratings (ratings) is stable.The ratings reflect AMEX’s balance sheet strength, which AM Best assesses as very strong, as well as its very strong operating performance, neutral business profile and appropriate enterprise risk management (ERM).AMEX’s balance sheet st